src/hotspot/share/gc/z/zLiveMap.inline.hpp
author eosterlund
Tue, 12 Nov 2019 20:01:23 +0000
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child 59039 c60978f87d45
permissions -rw-r--r--
8233061: ZGC: Enforce memory ordering in segmented bit maps Reviewed-by: pliden, stefank
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/*
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 * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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#ifndef SHARE_GC_Z_ZLIVEMAP_INLINE_HPP
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#define SHARE_GC_Z_ZLIVEMAP_INLINE_HPP
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#include "gc/z/zBitMap.inline.hpp"
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#include "gc/z/zLiveMap.hpp"
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#include "gc/z/zMark.hpp"
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#include "gc/z/zOop.inline.hpp"
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#include "gc/z/zUtils.inline.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/orderAccess.hpp"
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#include "utilities/bitMap.inline.hpp"
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#include "utilities/debug.hpp"
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inline void ZLiveMap::reset() {
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  _seqnum = 0;
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}
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inline bool ZLiveMap::is_marked() const {
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  return OrderAccess::load_acquire(&_seqnum) == ZGlobalSeqNum;
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}
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inline uint32_t ZLiveMap::live_objects() const {
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  assert(ZGlobalPhase != ZPhaseMark, "Invalid phase");
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  return _live_objects;
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}
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inline size_t ZLiveMap::live_bytes() const {
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  assert(ZGlobalPhase != ZPhaseMark, "Invalid phase");
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  return _live_bytes;
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}
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inline const BitMapView ZLiveMap::segment_live_bits() const {
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  return BitMapView(const_cast<BitMap::bm_word_t*>(&_segment_live_bits), nsegments);
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}
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inline const BitMapView ZLiveMap::segment_claim_bits() const {
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  return BitMapView(const_cast<BitMap::bm_word_t*>(&_segment_claim_bits), nsegments);
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}
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inline BitMapView ZLiveMap::segment_live_bits() {
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  return BitMapView(&_segment_live_bits, nsegments);
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}
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inline BitMapView ZLiveMap::segment_claim_bits() {
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  return BitMapView(&_segment_claim_bits, nsegments);
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}
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inline bool ZLiveMap::is_segment_live(BitMap::idx_t segment) const {
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  return segment_live_bits().par_at(segment);
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}
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inline bool ZLiveMap::set_segment_live_atomic(BitMap::idx_t segment) {
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  return segment_live_bits().par_set_bit(segment, memory_order_release);
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}
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inline bool ZLiveMap::claim_segment(BitMap::idx_t segment) {
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  return segment_claim_bits().par_set_bit(segment, memory_order_acq_rel);
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}
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inline BitMap::idx_t ZLiveMap::first_live_segment() const {
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  return segment_live_bits().get_next_one_offset(0, nsegments);
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}
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inline BitMap::idx_t ZLiveMap::next_live_segment(BitMap::idx_t segment) const {
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  return segment_live_bits().get_next_one_offset(segment + 1, nsegments);
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}
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inline BitMap::idx_t ZLiveMap::segment_size() const {
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  return _bitmap.size() / nsegments;
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}
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inline BitMap::idx_t ZLiveMap::index_to_segment(BitMap::idx_t index) const {
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  return index >> _segment_shift;
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}
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inline bool ZLiveMap::get(size_t index) const {
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  BitMap::idx_t segment = index_to_segment(index);
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  return is_marked() &&              // Page is marked
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         is_segment_live(segment) && // Segment is marked
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         _bitmap.at(index);          // Object is marked
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}
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inline bool ZLiveMap::set_atomic(size_t index, bool finalizable, bool& inc_live) {
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  if (!is_marked()) {
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    // First object to be marked during this
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    // cycle, reset marking information.
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    reset(index);
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  }
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  const BitMap::idx_t segment = index_to_segment(index);
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  if (!is_segment_live(segment)) {
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    // First object to be marked in this segment during
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    // this cycle, reset segment bitmap.
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    reset_segment(segment);
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  }
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  return _bitmap.par_set_bit_pair(index, finalizable, inc_live);
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}
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inline void ZLiveMap::inc_live_atomic(uint32_t objects, size_t bytes) {
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  Atomic::add(objects, &_live_objects);
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  Atomic::add(bytes, &_live_bytes);
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}
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inline BitMap::idx_t ZLiveMap::segment_start(BitMap::idx_t segment) const {
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  return segment_size() * segment;
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}
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inline BitMap::idx_t ZLiveMap::segment_end(BitMap::idx_t segment) const {
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  return segment_start(segment) + segment_size();
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}
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inline void ZLiveMap::iterate_segment(ObjectClosure* cl, BitMap::idx_t segment, uintptr_t page_start, size_t page_object_alignment_shift) {
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  assert(is_segment_live(segment), "Must be");
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  const BitMap::idx_t start_index = segment_start(segment);
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  const BitMap::idx_t end_index   = segment_end(segment);
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  BitMap::idx_t index = _bitmap.get_next_one_offset(start_index, end_index);
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  while (index < end_index) {
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    // Calculate object address
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    const uintptr_t addr = page_start + ((index / 2) << page_object_alignment_shift);
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    // Apply closure
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    cl->do_object(ZOop::from_address(addr));
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    // Find next bit after this object
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    const size_t size = ZUtils::object_size(addr);
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    const uintptr_t next_addr = align_up(addr + size, 1 << page_object_alignment_shift);
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    const BitMap::idx_t next_index = ((next_addr - page_start) >> page_object_alignment_shift) * 2;
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    if (next_index >= end_index) {
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      // End of live map
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      break;
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    }
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    index = _bitmap.get_next_one_offset(next_index, end_index);
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  }
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}
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inline void ZLiveMap::iterate(ObjectClosure* cl, uintptr_t page_start, size_t page_object_alignment_shift) {
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  if (is_marked()) {
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    for (BitMap::idx_t segment = first_live_segment(); segment < nsegments; segment = next_live_segment(segment)) {
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      // For each live segment
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      iterate_segment(cl, segment, page_start, page_object_alignment_shift);
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    }
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  }
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}
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#endif // SHARE_GC_Z_ZLIVEMAP_INLINE_HPP